Switching cabinets (also known as switches or power distribution units) are electrical equipment dominated by circuit breakers; this means that the manufacturer assembles in closed or open metal cabinets such as high-pressure appliances (including control appliances, protective appliances, measuring appliances) and parent lines, transport carriers, insulations, etc., as part of the receiving and distributing of electrical power in the electrical system, called metal switches, or switch cabinets, as required by the electrical primary circuit.